||Effects of pH on the Toxicities of Cadmium, Copper, and Zinc to Steelhead Trout ('Salmo gairdneri') (Journal Version).
Cusimano, R. F. ;
Brakke, D. F. ;
Chapman, G. A. ;
||Corvallis Environmental Research Lab., OR. ;Western Washington Univ., Bellingham. Inst. for Watershed Studies.
Water pollution ;
Lethal dosage ;
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
||Increased metal concentrations have been associated with freshwater acidification. Continuous-flow acute toxicity tests were conducted in soft water to determine the effect of pH on the toxicity of cadmium, copper, and zinc to small (1-6 g) steelhead trout (Salmo gairdneri). LC50 values were calculated for 96- and 168-h exposure periods in waters of pH 4.7, 5.7, and 7.0. Test fish were significantly more tolerant of the metals at the lowest pH value than at higher pHs. The 96-h LC50 values at pH 4.7, 5.7, and 7.0 were 671, 97, and 66 micrograms/L for zinc, 66.0, 4.2 and 2.8 micrograms/L for copper, and 28.0, 0.7 and less than 0.5 micrograms/L for cadmium, respectively. The 168-h results were similar to the 96-h values. The results indicate that for the metals tested, toxicity is ameliorated in depressed pH waters over short exposure periods, such as may occur during snowmelt runoff. The possibility of hydrogen ion interference with metal uptake is postulated.
||Pub. in Canadian Jnl. of Fisheries and Aquatic Science, v43 1986. Prepared in cooperation with Western Washington Univ., Bellingham. Inst. for Watershed Studies.
|NTIS Title Notes
||Reprint: Effects of pH on the Toxicities of Cadmium, Copper, and Zinc to Steelhead Trout ('Salmo gairdneri') (Journal Version).
||57Y; 57H; 68D
||PC A02/MF A01